JPS6117641B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In cutting a raw log into a predetermined length for mounting it on a veneer race, for example, the present invention determines in advance the axis of rotation of the raw log after cutting during machining. The present invention relates to a method and device for cutting raw wood logs so that the axis of rotation is in a plane perpendicular to the axis.

Generally, when manufacturing veneer veneer by cutting logs with veneer lace, the logs are placed on live rollers with a V-shaped cross section, transported to the cutting position, and placed on the live rollers. The length is measured from the end face and cut into unit lengths such as 5, 6, or 3 shaku.

However, a log log is a normal size with a diameter of 1
The log is approximately 8 to 20 meters long, and is often distorted as a whole, so if it is cut by positioning with a live roller, the cut end surface will be inclined with respect to the center of the log after cutting. It occurs in people's homes.

That is, as shown in FIG. 1, when a raw wood log 1 is conveyed in the direction of arrow A and cut with a chain saw arranged orthogonally to the center line X positioned by a live roller, the cut end faces a ₁ , a ₂ ,...a ₅ is
The center lines X ₁ , X ₂ , X ₃ , and X ₄ of the logs 1a, 1b, 1c, and 1d after cutting are not perpendicular to each other.

Therefore, such, for example, log log 1b
When mounting the log on a veneer race, as shown in Fig. 2, the gripping force of the chuck 3 of the spindle 2 becomes uneven, making it impossible to reliably transmit the rotational driving force, or causing the log to be placed in an off-center position. Since gripping pressure is applied in the direction of arrow B, problems such as bending of the log occur. Furthermore, when cutting under such conditions, both edges of the printed veneer veneer become non-parallel and need to be cut, and the logs are cut into long lengths to account for this, which reduces the yield. It also had the disadvantage of being low.

In order to solve this problem, the present inventors first cut a raw wood log into a predetermined length, and when mounting it on a veneer lace and machining it, the inventors of the present invention first cut the raw wood log into a predetermined length and mounted it on a veneer race. A method for cutting a raw wood log, the method comprising: determining a rotation axis at a time, and then cutting the raw wood log at a predetermined cutting point by moving the log so that the rotation axis is substantially perpendicular to the cutting surface of the cutting machine; and Invented the equipment used in this method,
A patent application was filed (Japanese Unexamined Patent Publication No. 1983-74101).

According to this method and device, the above-mentioned conventional difficulties can be overcome, but as mentioned above, the drive function is large-scale and a large space is required to correct the position of the logs of about 8 to 20 meters. There was a problem. The present invention has been made in order to eliminate such conventional drawbacks.Prior to cutting a raw log, the axis of rotation during machining of the log after cutting is determined, and then this axis of rotation is aligned with the cutting surface of the cutting machine. It is an object of the present invention to provide a method and apparatus for cutting logs into pieces, in which the cutting surface of the cutting machine is inclined so as to be substantially orthogonal to the log, and the log is cut at a predetermined cutting point.

In FIG. 3, reference numeral 4 denotes a live roller on which a raw wood log 5 is placed and conveyed in the longitudinal direction. 6
is a non-contact switch using a phototube that detects the tip of the log when the live roller is running and outputs a signal to stop the live roller. Reference numeral 7 denotes a chain saw that is installed to rotate in the direction of arrow C about a pivot 8 in a plane orthogonal to the conveyance direction of the live roller 4. The cutting direction of this chain saw 7 can be arbitrarily changed by a cutting direction correction device which will be described later.

Reference numerals 9 and 10 are a horizontal position detection device and a vertical position detection device for logs using image sensors, respectively, and their outputs are input to a control device (not shown) to determine the center of the log at the measurement position. Desired. Although only one pair of these horizontal position detection devices and vertical position detection devices are shown in the figure, two pairs are arranged at the tip and cutting portion of the log, and the control device uses the outputs of these two pairs of detection devices. The central axis connecting the centers of the raw wood logs in both measuring sections is determined.

Further, the control device controls the cutting direction correction device so that the central axis determined in this way is perpendicular to the rotational plane of the chain saw.

FIG. 4 shows an example of a cutting direction correction device used in the present invention, in which a rail 11 is arranged parallel to the conveying direction of the live roller 4, a trolley 12 is arranged on this rail 11, and the trolley A chain saw 7 is supported on the cutting blade 12 so as to be rotatable in a horizontal plane and tiltable in a plane perpendicular to the plane of rotation of the cutting blade. The truck 12 is configured to freely travel left and right on the rails 11 via a clutch or the like by means of a motor 13 mounted on the truck 12.

The rotation mechanism 14 mounted on the trolley 12 is
A support stand 16 is fixed horizontally on the rotating shaft 15, and the support stand 16 is rotated at an arbitrary angle within the horizontal plane by the power of the motor 13.

A base 17 is protruded near one end of the support 16, and a shaft bearing 19, which protrudes from one end of the lower surface of a support plate 18 to which the chain saw 7 is attached, is rotatably attached to the upper end of the base 17. Further, a bearing 20 is protruded near the other end of the support plate 16, and the base of a fluid cylinder 21 having an operating rod fixed to the other end of the lower surface of the support plate 18 is pivotally attached.

The cutting direction correcting device having the above configuration moves the cutting blade 7a of the chain saw 7 to the live roller 4 by driving the motor 13 in the direction of the arrow D and driving the fluid cylinder 21 in the direction of the arrow E, as shown in FIG. It is swung in the direction of arrow F within a plane including the transport direction, and rotated within a horizontal plane as shown by arrow G in FIG.

FIG. 7 shows detection devices 100 and 110 that are composed of a slit-shaped light source L and a light receiving section R in which a plurality of light receiving elements are arranged in a row in the longitudinal direction, as a horizontal position detecting device and a vertical position detecting device. This shows an example.

The horizontal position detection device 100 includes a light source L and a light receiving section R.
The logs 5 are placed horizontally opposite to each other with the raw wood log 5 between them, and the vertical position detection devices 110 are placed vertically and oppositely. In addition, as shown in FIG. 8, in order to avoid deterioration of sensitivity due to the accumulation of dust, etc., the pair of light source L and light receiving part R, which are arranged facing each other with the log 5 in between, is tilted at 45 degrees from the horizontal position. They may also be arranged in an intersecting manner.

It should be noted that since the configuration other than the detection device is the same as that of the embodiment shown in FIG. 3, the same parts are given the same reference numerals and the explanation will be omitted.

In the ball cutting device shown in FIG. 3, a long log 5 is placed on a live roller 4 and
sent in the direction. When the tip reaches the position of the non-contact switch 6 and is detected by the non-contact switch 6, a stop signal is output from the control device to the drive device of the live roller 4. Here, the log cutting position coincides with the cutting position of the chain saw 7.

Next, the horizontal position detecting device 9 and the vertical position detecting device 10 measure the spatial positions of the tip and cut portion of the log, and the measurement results are input to a control device (not shown), where the log is A rotation axis connecting the centers of is determined, and a drive signal is outputted to drive the motor 13 and fluid cylinder 21 of the cutting direction correction device so that this rotation axis is perpendicular to the cutting surface by the chain saw 7. Upon receiving this signal, for example, the fluid cylinder 21 swings the cutting blade 7a of the chain saw 7 in the direction of arrow F as shown in FIG. 5, and the motor 13 swings in the direction of arrow G as shown in FIG. Rotate. Incidentally, by tilting the cutting blade 7a of the chain saw 7, the length measured at the rotation axis of the log will be different from the initially measured length, but in this case, the driving force of the motor 13 may be changed as necessary. The carriage 12 is
The signal is transmitted to the axle of the truck 12 to move the truck 12 back and forth on the rail to correct the position.

The above operations are similarly performed in the embodiments shown in FIGS. 7 and 8.

In addition, instead of the above operation, the light reception result of the detection device may be displayed on the operator's operation control panel, and the operator may adjust the position of the log while looking at this display.

Thereafter, the raw wood log is fixed with a suitable holding member as required, and the chain saw 7 is operated to cut the raw wood log. In addition, Chainsaw 7 is the 6th
As shown in the figure, it is desirable to install two units along the conveyance direction so that shaping of the tip and cutting to a fixed length can be performed simultaneously.

FIG. 9A shows the cutting positions of the raw wood log cut according to the above embodiment, and each cutting surface a′ ₁ ,
a′ ₂ ,...a′ ₇ is the cut X ₁ when the veneer lace is installed,
It is orthogonal to X ₂ , X ₃ , and X ₄ .

Note that these rotation axes X ₁ , X ₂ , X _{3 ,} and It is also possible to find an axis and use this rotation axis. Also, if necessary, without cutting twice at a' ₂ , a' ₃ , a' ₅ , a' _{6 ,} etc., as shown in Fig. 9B,
Correct the log position so that it is at an intermediate angle.
Cuttings may also be made at a″ ₁ , a″ ₂ , a″ ₃ , a″ ₄ , a″ ₅ .

According to the present invention configured as described above, since both end surfaces of the log after being cut are perpendicular to the rotation axis when the veneer lace is mounted, the chuck of the spindle evenly presses the end surface of the log, thereby increasing the driving force. is uniformly transmitted to the log, and the direction of the pressing force also coincides with the direction of the rotating shaft, so cutting is carried out smoothly and the log does not bend. Furthermore, both edges of the shaved veneer veneer are parallel, and the portion removed by the scraping knife is small, so the yield is improved. It also eliminates the conventional labor of manually measuring the log and setting the cutting position each time.

In addition, since the cutting surface of logs can be corrected by tilting the cutting surface of the cutting machine without moving the log, the drive mechanism can be small and the process can be done in the same space as before. be able to.

In the above embodiments, a non-contact type detection device was used as a detection device for detecting the spatial position of logs, but the present invention is not limited to such embodiments, and a contact type detection device is used. The number of locations to be placed is not limited to two near both ends, but may be increased as needed.

Furthermore, the chain saw 7 is rotatable only in a plane orthogonal to the rotation plane of the cutting blade, and the position of the log in the horizontal plane is corrected by configuring the live roller 4 to be movable in the horizontal direction. Good too.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the cutting direction of a raw wood log by the conventional method, Fig. 2 is a front view showing the state in which the log cut by the conventional method is held in a chuck of veneer lace, and Fig. 3 is the present invention. FIG. 4 is a rear view showing a cutting direction correction device used in the present invention, and FIGS.
7 is a perspective view showing another embodiment of the present invention, and FIG. 8 is a spatial position of still another embodiment. Front view showing the detection device, FIG. 9A,
B is a side view showing the cutting direction of the raw wood log according to the present invention. 4... Live roller, 6... Non-contact switch, 7... Chain saw, 9... Horizontal position detection device, 10... Vertical position detection device.

Claims (1)

[Scope of Claims] 1. When cutting a raw log into a predetermined length and machining it, the rotational axis during machining of the log after cutting is determined in advance, and then this rotational axis is connected to the cutting machine. A method for cutting raw wood logs into balls, characterized by cutting the raw wood logs at predetermined cutting points by tilting the cutting surface of a cutting machine so as to be substantially orthogonal to the cutting surface of the log. 2. A cutting device whose blade moves in a substantially vertical direction to cut a log placed substantially horizontally into a predetermined length, and at least two spaces in the longitudinal direction including the vicinity of both ends of the log after cutting the log. a detection device that detects the position; a cutting direction correction device that tilts the cutting surface of the cutting device in any direction at any angle;
Control for determining a rotational axis during machining of the log after cutting from the detection result of the detection device, and controlling the cutting direction correction device so that the rotational axis is substantially perpendicular to the cutting surface by the blade of the cutting device. A device for cutting raw wood logs. 3 A transport device that transports logs in the longitudinal direction is
3. The ball cutting device according to claim 2, wherein the conveyance path is arranged to be substantially perpendicular to the cutting surface of the cutting device. 4. The round cutting device according to claim 3, wherein the conveyance device is provided with a stopper that stops the cutting portion of the log at the cutting position of the cutting device. 5. The ball cutting device according to any one of claims 2 to 4, wherein the detection device is an optical detection device that detects the spatial position of the log in a non-contact manner. 6. Any one of claims 2 to 5, wherein two cutting devices are arranged in parallel so that the interval between the blade parts is equal to the length of the log to be cut.
Ball cutting device described in section.